如果只有一种生产要素可以变动，那么，该要素合理投人量应处于（ )。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31439' and id < 2520450 and id<>'2520450' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31439' and id > 2520450 and id<>'2520450' order by id asc limit 5